Drilling machine



eb 927 G. H. GILMAN DRILLING MACHINE Filed Jan. V6, 1923 2 Sheets-Sheet l l @w mm. .am m56 S l, Il VI lwhlwv mm, @Q m6 lill hm.. l n m6 I 1 mw mw f @RW mw AW hm l mw Y m. mw @www m Sgn@ S QQ n 5 Feb. s, 1927.

" l G. H. GILMAN I' DRILLING-MACHINE -v Filed Jan. e, 192s 2 sheets-sheet 2 Patented Feb. 8, 1927.,v

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GEORGE H. GILMAN, OF BELMONT, MASSAC;HSETTS.`

DRILLING MACHINE.

Application filed January the following description when read in the light of .the accompanying drawings of one speciiic embodiment of my invention submitted tor illustrative purposes, while the scope of my invention will be more particio ularly pointed out in the appended claims.

` In the drawings-y l Fig. 1 showsa longitudinal section of a hammer rock drill; Fig. 2 is a section of the rearward Vend ofy the rock drill on the line 2-2 .of Fig. 1';

3 is a section on the line 3 3 of Fig.1; and

Figs. 4, 5, 6 and 7 respectively aresections on the lines 4 4, 545,- 6-6 and 7"7` of Fig.2. l s l" y yReferring, .to the drawings `the drilling tool is exempliiied by the drill-steel l, the shank 3' of which is carried by the chuck 5 in such manner that Ythe drill steel must rotate with the chuck. Rearwardly of the drill steel I mount a reciprocating piston, the sai-ne as shown being provided with a head 7, forward extension 9, and .rearward extension 11, the latter being reduced in diameter at 13 adjacent its juncture with the head.

As illustrated the casing `for the rock drill includes a section 15 which has `a bore.

17 in which the chuck is rotatively mounted and which receives the forward extension 9 ojf the piston. The casing' vsection 19 located rearwardly of andv abutting the section 15 has a bore 21 receiving the hea d 7 or' the piston, and a bore 23v receiving the 'forward enf tension 9 ot .the piston. Abuttingz,- the rearward side of the section 19 is a casing section 25 which has a bore 27 inwhich is permanently secured the casing section 29, the latter being provided with the 'bore 81 which receives the rearward extension 11 of the piston. The rearward facejof the casing section 25 Ais recessed to receive the exterior "flange 32 of the section 29." Rearwardly of vthe Hangs the section 29 is reduced in diameter'at 33 and rearwardly of the reduced vdiameter portion 33 it is further reduced in -diameter at' 35 to provide the shoulder 37.

For supplying mot-ive fluid 'for operating the piston, the exterioroi'l the portion of the casing section 29 receivedin 'the bore 27 of the casing section 25y is shown as Aprovided with annu-hir grooves .39 and nfjlti'e former 6, 1923. serial ne. 611,173.

of whichasshown by `Fig. 2 is adaptedl tov be placed lin communication with'a'source of motive luid supply vby Vway of the passage 43 leading from the throttle valve 45, while the groove 41 as .shown by lig. 1 is .placed in communication with the forward end of the bore 21by means otpassages 47. .Further for placingv the annular groove 39 in' ycommunication with' .the'boi'eBl is shown a pair of diainetrically oppositeradial passa'ges49 shown ,in Fig'. 1, and leading rearwardly through the wall of t-he casing `section 29' as shown by igs. l, 4 and y6l are twogroups of longitudinal passages 51 which vat their forward ends intersect the radial passages 49 and atl their rearwardfends are placed 'in communication with the bore 31 meansl of an intersecting annular groove 53 formedv as an enlargement"oi-*said bore. Intersecting each group of passages 51 and thecorrespending radial passage 49 are shownshort slots 55 forinedin' the wall of the vbore'l. As shown best by Fig. 2 in the' same'planefas the slots 55 is a `pair of diametrically opposite radial passages 57y which connect the bore 31 with the annular groove 41. Y y

F or exhausting the motive `fluid which operates `the kpiston I herein form in the intermediate portion otthebore 21, asshowgn by Fig. 1, a kpocket 5.9; whichis T)laced yin communication with the exhaust nozzle 6l the machine by means of passages 63'.

In the operationo the machine when the throttle valve 45 places the passage 43,11; communication with a source of motive fluid supply, motive fluid enters the groove 39 and passes yto'the,'rearward` end of the cylinder by way of the grooves 55, ,passages ,51 and groove-53, and in consequence otthis motive Huidy continuously acts uponft-he rearward .endof the extension 1-1 fof the piston. In

the position'ofl parts las shown.inFigsy Vl and 2 of the drawings motive fluid will ,pass from the'bore Blfinto lthe groove 41`byway of the radial passages 57, and thence lto the `forward end ofV the bore 21 by way of the passages 47 ,i the grooves 55 at this time actiing to supplyadditional' motive fluid to the l i bore 31.- In consequence of this the'piston will make its rearward stroke, the 4motivel llO ,the extension ll into communication withA the radial passages 49 motive fluid flows from the latter into therearward end of the bore 21. In consequence they piston moves forwardly due tothe pressure on the rearward face of the head 7 and rearward end of the extension 11, the motive fluid in front of the head 7 exhausting to the atmosphere by way of the pocket 59.

As ,the particular details of the hammer piston and the way in which it is recipro- .cated doA not formpart ofv my presentin vention lthe same will not be further de- Y scribed.k

I :will now describethe present illustrative embodiment of the mechanism andassociated lparts provided for rotating the chuck. On the reduced diameter poi-tion 35 of the casing section 29 is mounted the( sleeve-like casing section which at itsY forward end has a flange 67 abutting the shoulder 37 of the casing section 29.y Formed in the outer surface' of the section 65 is an annular groove 69 closed bythe adjacent surface of the section 71 which surrounds and is permanently secured to the section 65. Between of the recesses 79 is a gear 85 in mesh with the gear 83. The gears. 85 are removably keyed to' shafts87 which extend forwardly through the casing to the rearward end of the chuck. At their forward ends the shafts 87 each `carry a pair of oppositely disposed eccentrics 8,9 formed integrally with the shafts and upon opposite eccentrics are mounted the yokes `91. Each yoke 91 is provided with internal gear teeth 93,*,wliich Amesh with external gear teeth 25 upon the chuck. By this construction it will be no- -ticed that when the shafts rotate they must rotate inun'ison, which will cause the yokes to be gyrated on an orbit' the diameter of i 'whichis twice the eccentricity of the eccen trics 89, and that this willy cause the chuck to be rotated at a much slower speed than the shafts.

For rotating theshafts I employ fluid pressure actuated motor mechanism. I-Ierein to this end as sho-wn by Figs. 17 2 and 6 the casing section is recessed at opposite sides to form in conjunction with the reduced diameter portion 33 of the section 29 av pair of annular chambers 97 they inner wall ofv which is the reduceddiameter portion 33 of the casing section 29 and the outer wall of which is the peripheral portion of the casing section 75', the chambers being separated by the diaphragm 98 formed by recessing the casing section 75.

Each annular chamber 97 is shown diyand contractable when the yoke 103 moves by any suitable means cooperating with thewalls of the casing.l Herein I have shown th-e outer chambers 99 so rendered, the same being each sub-divided into two chambers by means of the vanes 1057 each vane having a cylindrical head 10! mounted for oscillation at the. ends of the major axes of the members 103, and the opposite ends of the vanes being received in slots 108 of the plugs 109 mounted for oscillation in the casing sections 75 and adjacent portions of th-e casing sections 25 and 73. As clearly illustrated in Fig. 1 the vanes 105 'and members 103 laterally fit the diaphragm 98 and walls of thek chambers 97 opposite the diaphragm in a l.

fluid tight manner. The members 103 are mounted upon eccentrics 111 formed inte-` grally with the shafts 87, the shafts between the eccentrics being provided` with integral disk like portions 113 of larger diameter U than the eccentrics and rotating the cylindrical openings 115 formed in the diavphragm 98 coaXially with the shafts. It will be understood by this construction that if the members 103 are caused yto gyrate the chuck will be driven through the reduction gear at the forward end of the shafts. The gyration of the members 103 I cause by admitting and exhausting motive fluid to and from the eXpansib-le chambersand for the purpose of increasing the power of the arrangement I preferably make the eccentrics 1110i greater eccentricity than the eccenf trics 89. For controlling the motive'jfiuid admitted to and exhausted from.. the expansible chambers I provide a rotary valve 117 which is keyed to a gear 119 shown in Figs. 2 and 4 meshing with the gear 83 and which is of the saine pitch diameter as the gears so that the valve willrotate in unison with the shafts 87. y

As shown in Fig. 1 the valve 117 herein is in the form of a tube separated into two portions by means of the diaphragm 121. The forward end of the tube is placed in communication with the motive fluid supply by way of the passage 123I leading to the throttle valve 47, while the rearward end of the valve is placed in `communication with t-he atmosphere by way of a lpassage- 125, shown iii-Figs. 2 and 7 leading to the exhaust nozzle 61.

As shown in Figs. 2, 5 and 6 the interior of the tubular valve 117 upon opposite sidesl of the diaphragm 121 is placed in commusaid bore.

Vcation therewith a. passage 143 leading to a semi-annular groove 145, the latter formed nica-tion with the exterior of the val-ve by means of slots 127 and 129. Referring to Fig. 5 it will be Lnoticed lthat 'in the plane of casing section 29,and that leading from the f annularI groove 33 toward the bottom of the casing is a passage 135. y rlhe passage 1,31 is placed in communication with the expansivblc chamber at ythe upper side ofthe rearward member 103 by way of the port 137, shown in Figs. 2 and 5, while the passage 135 is placed in communication with the expansible chamber at thelower side of the forward member 103 by way of a similar passage 139 as indicated by Fig. 5. From this it will be seen that as the valve rotates motiveliuid will be intermittently supplied to the passage 131 `by way ofthe slot 127 of the valve, and that this will intermittently supply niotive fluid tothe .expansible chamber at the upper side ofthe rearward member 103 and to the expansible chamber at the lower side ofthe forward member 103. Again referring to Fig. 5 it will be seen that formed in the casing section is also a passage 141 which intersects the bore receiving the valve 117 in the plane of the slot 127 opposite the point of Vintersection of the passage 131 with The passage 141 has in communiin a similar manner to the semi-annular groove 133, and leading from the groove 145 is apassage 147. The passage 143 opens into the expansible chamber at the upper side ofthe forward member 103 by -way of a port 147, while the .passage 147 is placed in communication with the eXpansible chamber at the lower side of the rearward member 103 by way of a port 149. It will be noticed'by `the above described construction that the slot .motive fluid, and vice versa.

As clearly shown by Fig. 5 'the semilannular groove 133 has opening into it a passage -151 with which communicates a passage 153. The passage 153 in the plane of theslot 129 ofthe `valve as shown by Fig. 6 opens into vthe yboreii-eceiving said valve by way of a port V155. Opposite the port 155 is a port 157 which leads by way of the passage 159 to the passage 143. As heretofore indicated thel groove 133 and `passage 143 are in coinmunication with eXpansible chambers at op? posite sides ofthe members l103, and consevgroove 69 as shown Ain Fig. 2.

.quently --as the valve rotates the opposite Sides of these members will be .alternately placed `in communication with the -atmosphere by the slot 129,.. The ports .and passages of course are so timed as tocausethe eXpansible chambers at one lside of each member 103 to be exhausted when the chambers at the opposite side are supplied with motive fluid. i

For venting the leakage to the chambery 101 I place in communication therewith a passage `161 which opens into the vannular y riilie annular groovev 69 is placed in communication .with the .passage 125 by way of the passage 163, as clearly showiiin Figs. 2 and `7.

For holding` theparts iii assembled relation l nave shown the four side bolts 165A which extend from one :end ofthe machine to the other. For permitting the section 25 to be removed together with the :motor with,` out disassembling the latterfI form Vin the reduced ydiameter portion 355 of the .casing section member 29 a socket 167 into which is `screwed a plug 169 having a flange 171 en; yi .gagmg the rearward faces/ of the casing sec-l tions 65 and Further `for thispurpose each rshaft 37 is made in two sections,.the rearward section`.1f7.3 which carries the `gears and eccentrics 107 having an e'n`d`175. of square cross-section which is detachably received in the .socket 177fof`sin'iilar cross-seo .tion formed in the end of the forwardsection 179 ofthe shaft.I 1

Although -I have described for purposes of illustration one specific embodiment oi' my invention it is to be Tunderstood that within the scope of my .invention wide deiin ifi

viations may be made therefrom without del parting from the spirit of my invention.

Claims.- 1. In a rock drill, .a chuck formed for carryinga drill` steel, a hammer .piston for operating said drill steel, `a casing for said chuck and. hammer piston, a pair of rotatably mounted shafts .positioned .at opposite sides of said casing and extending `fi'oiii the forward'y to the rearward! end `of said cas- "ing, a pair of cceentrics adjacent each end of each shaft, a :pair of yokes at. the forn ward end of said casingapair of yokes at the rearward end .of said casing,l said yokefs at the forward end having internal. gear teeth meshedwith external gearteeth on `said chuck, all ofv said yokes being` mounted upon said eccentirics,'means for causing said'` .shaftsto rotate in unison, and means per-` mitting motive liuid to act upon said yckcs at the rearward end of said `casing for causcasing, a` gyratory yoke at the rearward endr of-said casing, means enforcing conjoint movement of said yokes, 4a .piston vvhaving y to said chuck;

forward and rearward extensions of reduced diameter reciprocating inv said casing through said yokes, the'yoke atv the forward end of said casing surrounding said chuck and being geared thereto, and means for permitting motive iuid to actupon v.the exterior of said yoke at the rearward end of 'said casing for causing said conjoint movement of said yokes.

3. In a rock drill, a chuck, a casing, a gyratory yoke at the forward end of said casing, a gyratory'yoke at the rearward end ofsaid casing, means enforcing conjoint movement of said yokes, a piston having a rearward extension ofreduced diameter reciprocating in said casing through said yokeat the rearward 'end of said casing, the yoke at the forward end of said casing surrounding said chuck and being geared thereto, and means for kpermitting motive fluid to act upon the exterior of said yoke at the rearward endof said casing for causing f said conjoint movement of said yokes.

4.7 Ina rock drill', a piston having arear- Vward-vv extension ofreduced diameter, a chuck formed for carrying a drill steel operated by said piston, a casing for said chuck and piston, the portion of said casing receiving said extension of said piston being eXteriorly reduced,'a gyratory member suri'oundingfsaid portion of said casing,means for lpermitting motive fluid to -act upon the exterior of said gyratory member for operit, and reduction gearing for transating gyratory member mitting motion of said 5. In a rockl drill, a piston having a rearward extension of reduced diameter, a chuck formed for carrying a drill steel operated by, said piston, a casing for said chuck and piston, the portion of said casing receiving said extension of said'piston being exteriorly reduced, a pair-of gyratory members surrounding said portion of said casing, means for permitting motive Huid to act upon said .gyratory members for Operating them, and `reduction gearing for transmitting the niotion of said gyratory members to said chuck.

6. In a rock drill, a piston having a rearward extension of reduced diameter, a'chuck formed for carrying a drill steel operated yact upon said gyratory members for operating them, and reduction gearing for transmitting the motion of said gyratory inembers to said chuck.

7, In a rock drill, a piston having a rearward extension of reduced diameter, a chuck formed for carryinga drill steel operated by said piston, a casing receiving said chuck and piston, saidy casing providing a wall tions to rotate said chuck.

8. In. a. drilling machine, a chuck having external gear teeth, a gyratory i'nembei surrounding said chuck and having internal gear teeth meshing with the gear teeth on said chuck, a second gyratory member mounted rearwardly of said chuck, means enforcing conjoint movement ofr said gyra.- tory Amembers, and means for permitting motive Huid to act upon the exterior of said second gyratory member for causing said conjoint movement.

9. In a rock drill, a piston having a rearward extension of reduced diameter, a chuckformed for carrying a drill steel operated by said piston, a casing receiving said y chuck andpiston, said casing providing a wall with a bore for said rearward extension and a pair of annular chambers about saidv wall, gyratory members in said chambers, said gyratory `ineriibers surrounding vsaid wall and dividing said chambers each y into a pair of sub-chambers, means associated with saidr casingand gyratory members for rendering oneof said sub-chambers of each pair alternately expaiisible and contractable when said gyratory members operate, means permitting motive fluid to be admitted and exhausted to and from said subchambers so rendered for yacting' in each case directly upon a surface of the gyratory member and on an opposed surface of said casing for causing gyration of said member, and means for causing the gyrations of said members to rotate said chuck.

l0. In a drilling machine, a chuck having external gear teeth, a gyratory member surrounding said chuck and having internal gear teeth meshing with the gear teeth on said chuck, a second gyratory l member mounted rearwardly of said chuck, a casing for said chuck and both gyratory members, said casing providing an annular chamber having inner and outer walls,said second gyratory member being received in said annularichamber and surrounding said inner wall, means associated withfone of said walls and said second gyratory member to form an expansible chamber, and means permitting rei-ease for carrying a drill steel, a hammer piston for operating said drill steel, said hammer' piston having ahead and a portion of reduced diameter, a casing in which said chuc'k and hammer piston are mounted, said casing being formed to provide an annular chamber rearwardly of said chuck about said portion of said hammer piston ofreduced diameter, said annular chamber'having'inner and outer walls, a gyratory member received in said annular chamber and surrounding said inner wall, means cooperating with one of said walls of said annular chamber and the opposed wall of said member to form an expansible chamber, means for admitting motive fluid into said expansible chamber to act directly upon the opposed walls of said annular chamber and member and for exhausting said motive fluid therefrom, said admission and exhaust of motive fluid causing gyration of said member, and means for causing the gyration of said member to rotat-e said chuck.

12. In a drilling machine, a piston having a head and a. rearward extension, a casing for said piston having a portion of large diameter' for said head and a portion of smaller diameter for said rearward extension, a gear and a gyratory member surrounding sald portion of smaller diameter, shafts, pinions Von said shafts meshing with said gear, an eccentric on each shaft, said gyratory member being mounted on said eccentrics, means permitting motiveV fluid to act upon the exterior of said gyratory member for gyrating it and rotating said shafts, a chuck, and a reduction gearing operatively connecting at least one of said shafts to said chuck.

13. In a drilling machine, a chuck, a motor for driving said chuck, said motor comprising a member mounted for gyration about the axis of said chuck, eccentrics at the sides of said axis supporting said member, means causing one eccentric to rotate when the other rotates, means permitting motive fluid to act on said member for gyrating it, a valve for controlling Isaid motive fluid` a speed reducing connection between said member and chuck, and means causing said valve to move conjointly with said member.

11i. In a drilling machine, a chuck, a motor for driving said chuck, said motor comprising a member mounted for gyration about the axis of said chuck on eccentrics at the sides of said axis, means permitting motive fluid to act on said member for gyrating it, a rotary valve for controlling said motive fluid, a speed reducing connection between said `member and' chuck', kand means causing' saidvalve to move coi'llloin'tly with said member.`

' 15. In a drillingmachine, a

' tor fordriving'said chuck, said' motor cornprising a gyratory member, axially spaced' ecce'ntrics upon lwhich said gyratory member is mounted, a rota-ry valvefor 'controlling the motive fluid for said motor, a pinionv associated with each eccentric, and a comk mon gear for connecting'said pinions andlro'- tatin'g said Valve. f

16'. Ina' drilling machine, a chuck, a motor for driving said chuck, said motor comprising a member mountedupon oppositelyy positioned eccentrics for gyration about the axis of said chuck, means causing one eccentric to rotate when the'other rotates, and a rotary valve for controlling motive fluid for operating said gyratory member.

`17. In a drilling machine, a drill steel, an impact motor for operating said drill steel,

an independent motor coaxial with said drill steel for rotating said drill steel, speed're- 4 ducing mechanism for transmitting the motion of'said motor to said drill steel, a shaft parallel to the axis of said drill steel connecting said independent motor and speed reducing mechanism, and a valve for said independent motor driven by said shaft.

18. In a drilling machine, a chuck, a fluid pressure operated motor memberl mounted for gyration about the axis of said chuck on spaced eccentrics, a rotary valve for controlling the motive fluid for said gyratory member, and means including said eccen-v trics for converting the gyratory motion` lof said member to rotary lmotion and for imparting it to said chuck and to said valve.

19. In a drilling machine, a casing in which is mounted a pair of gyratory members, means forming with said casing and' one of said gyratory members an expansible chamber, a 'chuck surrounded by anotherof` said gyratory members, said chuck carrying external gear teeth in mesh with internal gear teeth carried by said gyratory member which surrounds said chuck, shafts carrying eccentrics for supporting both gyratory members, and the eccentrics supporting the gyratory member forming part of the expansible chamber having an eccentricity greater' than those which support the gyratory member surrounding said chuck.- j

20. In a drilling machine, a motor com-` prising a fluid pressure operated member supported upon eccentric mechanism, a second member supported upon eccentric mechanism vof lesser eccentricity, a chuck, and means causing said first mentioned member to drive the second mentioned and the second mentioned to drive the chuck.

21. In a drilling machine, a fluid pressure operated member supported for orbital i movement, a second member supported for ythe orbital movement of ,the first mentioned "memben-a chuck, and means causing said 'gie first mentioned member to drive said'second mentioned member and the latter to' drive said chuck.

22. In a drilling machine, a fluid pressure operated member supported for orbital movement, a second member supported for orbital movement of different amplitude from the orbital movement of the rst mentioned member', a chuck, and means causingl comprising a gyratory members, a second gyratoi'y member, a transmission between n, said gyratory member increasing the torque impressed upon said second member by said first member, and reduction gearing connecting said second member to said chuck.

24:. In a drilling machine, a chuck, a chuck driving motor coaxial With said chuck,ka gyratory gear member meshing With` gear teeth on said chuck or driving the latter, andy a transmission between said motor and gyratory member lfor increasing the torque impressed upon said gyratory member by said motor.

In testimony whereof, I have signed my name to this specification.

GEORGE HL GILMAN.

CERTIFICATE 0F coRRECTloN.

bien; No. g 1 .616, 4848. Granted February. S, 1927, to

GEoRGE H. GILMAN.

It. is hereby certified thav error appears in `the printed lspecifica t'ion of the. `above numbered patent requiring correction as follows: Page 6, line 17, claim 23, for the word""members" read "member" and line, 19, Isame claim, for 'the word "membei-Tread "members"; and that the said Letters'latent should'be readwith. thee eorretiiqns therein `that the slme may conformto/lthe `record yof the ease in the .PatentQi--ffice Signed gndeeal'ed this 22nd day of March, A'. l), 1927.

M. Ja, Moore,

Seil et ing VConmissoue'r ofatexits'. 

